diff --git a/src/solver/utils/ortools_utils.cpp b/src/solver/utils/ortools_utils.cpp
index 19d3090cf2..2854a2f6eb 100644
--- a/src/solver/utils/ortools_utils.cpp
+++ b/src/solver/utils/ortools_utils.cpp
@@ -50,9 +50,9 @@ ProblemSimplexeNommeConverter::ProblemSimplexeNommeConverter(
     auto myid = std::this_thread::get_id();
     std::stringstream ss;
     ss << myid;
-    auto log_file = log_directory / (std::string("thread_") + ss.str() + ".log");
+    auto log_file_per_thread = log_directory / (std::string("thread_") + ss.str() + ".log");
     // TODO
-    log_writer_.open(log_file, std::ofstream::out | std::ofstream::app);
+    log_writer_.open(log_file_per_thread, std::ofstream::out | std::ofstream::app);
     log_streams.push_back(&log_writer_);
 }
 
diff --git a/src/solver/utils/ortools_utils.h b/src/solver/utils/ortools_utils.h
index 0b7053b0db..ac956335af 100644
--- a/src/solver/utils/ortools_utils.h
+++ b/src/solver/utils/ortools_utils.h
@@ -2,6 +2,7 @@
 
 #include <map>
 #include <string>
+#include <fstream>
 
 #include <antares/writer/i_writer.h>